src/mesa/swrast_setup/ss_triangle.c

   1 /* $Id: ss_triangle.c,v 1.20 2002/10/29 22:25:57 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keith@tungstengraphics.com>
  28  */
  29
  30 #include "glheader.h"
  31 #include "colormac.h"
  32 #include "macros.h"
  33 #include "mtypes.h"
  34
  35 #include "tnl/t_context.h"
  36
  37 #include "ss_triangle.h"
  38 #include "ss_context.h"
  39
  40 #define SS_RGBA_BIT         0x1
  41 #define SS_OFFSET_BIT       0x2
  42 #define SS_TWOSIDE_BIT      0x4
  43 #define SS_UNFILLED_BIT     0x8
  44 #define SS_MAX_TRIFUNC      0x10
  45
  46 static triangle_func tri_tab[SS_MAX_TRIFUNC];
  47 static quad_func     quad_tab[SS_MAX_TRIFUNC];
  48
  49
  50 static void _swsetup_render_line_tri( GLcontext *ctx,
  51                                       GLuint e0, GLuint e1, GLuint e2,
  52                                       GLuint facing )
  53 {
  54    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  55    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  56    GLubyte *ef = VB->EdgeFlag;
  57    SWvertex *verts = swsetup->verts;
  58    SWvertex *v0 = &verts[e0];
  59    SWvertex *v1 = &verts[e1];
  60    SWvertex *v2 = &verts[e2];
  61    GLchan c[2][4];
  62    GLchan s[2][4];
  63    GLuint i[2];
  64
  65    /* cull testing */
  66    if (ctx->Polygon.CullFlag) {
  67       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
  68          return;
  69       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
  70          return;
  71    }
  72
  73    if (ctx->_TriangleCaps & DD_FLATSHADE) {
  74       COPY_CHAN4(c[0], v0->color);
  75       COPY_CHAN4(c[1], v1->color);
  76       COPY_CHAN4(s[0], v0->specular);
  77       COPY_CHAN4(s[1], v1->specular);
  78       i[0] = v0->index;
  79       i[1] = v1->index;
  80
  81       COPY_CHAN4(v0->color, v2->color);
  82       COPY_CHAN4(v1->color, v2->color);
  83       COPY_CHAN4(v0->specular, v2->specular);
  84       COPY_CHAN4(v1->specular, v2->specular);
  85       v0->index = v2->index;
  86       v1->index = v2->index;
  87    }
  88
  89    if (swsetup->render_prim == GL_POLYGON) {
  90       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  91       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  92       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  93    } else {
  94       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  95       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  96       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  97    }
  98
  99    if (ctx->_TriangleCaps & DD_FLATSHADE) {
 100       COPY_CHAN4(v0->color, c[0]);
 101       COPY_CHAN4(v1->color, c[1]);
 102       COPY_CHAN4(v0->specular, s[0]);
 103       COPY_CHAN4(v1->specular, s[1]);
 104       v0->index = i[0];
 105       v1->index = i[1];
 106    }
 107 }
 108
 109 static void _swsetup_render_point_tri( GLcontext *ctx,
 110                                        GLuint e0, GLuint e1, GLuint e2,
 111                                        GLuint facing )
 112 {
 113    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 114    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 115    GLubyte *ef = VB->EdgeFlag;
 116    SWvertex *verts = swsetup->verts;
 117    SWvertex *v0 = &verts[e0];
 118    SWvertex *v1 = &verts[e1];
 119    SWvertex *v2 = &verts[e2];
 120    GLchan c[2][4];
 121    GLchan s[2][4];
 122    GLuint i[2];
 123
 124    /* cull testing */
 125    if (ctx->Polygon.CullFlag) {
 126       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
 127          return;
 128       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
 129          return;
 130    }
 131
 132    if (ctx->_TriangleCaps & DD_FLATSHADE) {
 133       COPY_CHAN4(c[0], v0->color);
 134       COPY_CHAN4(c[1], v1->color);
 135       COPY_CHAN4(s[0], v0->specular);
 136       COPY_CHAN4(s[1], v1->specular);
 137       i[0] = v0->index;
 138       i[1] = v1->index;
 139
 140       COPY_CHAN4(v0->color, v2->color);
 141       COPY_CHAN4(v1->color, v2->color);
 142       COPY_CHAN4(v0->specular, v2->specular);
 143       COPY_CHAN4(v1->specular, v2->specular);
 144       v0->index = v2->index;
 145       v1->index = v2->index;
 146    }
 147
 148    if (ef[e0]) _swrast_Point( ctx, v0 );
 149    if (ef[e1]) _swrast_Point( ctx, v1 );
 150    if (ef[e2]) _swrast_Point( ctx, v2 );
 151
 152    if (ctx->_TriangleCaps & DD_FLATSHADE) {
 153       COPY_CHAN4(v0->color, c[0]);
 154       COPY_CHAN4(v1->color, c[1]);
 155       COPY_CHAN4(v0->specular, s[0]);
 156       COPY_CHAN4(v1->specular, s[1]);
 157       v0->index = i[0];
 158       v1->index = i[1];
 159    }
 160    _swrast_flush(ctx);
 161 }
 162
 163 #define SS_COLOR(a,b) COPY_CHAN4(a,b)
 164 #define SS_SPEC(a,b) COPY_3V(a,b)
 165 #define SS_IND(a,b) (a = b)
 166
 167 #define IND (0)
 168 #define TAG(x) x
 169 #include "ss_tritmp.h"
 170
 171 #define IND (SS_OFFSET_BIT)
 172 #define TAG(x) x##_offset
 173 #include "ss_tritmp.h"
 174
 175 #define IND (SS_TWOSIDE_BIT)
 176 #define TAG(x) x##_twoside
 177 #include "ss_tritmp.h"
 178
 179 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
 180 #define TAG(x) x##_offset_twoside
 181 #include "ss_tritmp.h"
 182
 183 #define IND (SS_UNFILLED_BIT)
 184 #define TAG(x) x##_unfilled
 185 #include "ss_tritmp.h"
 186
 187 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
 188 #define TAG(x) x##_offset_unfilled
 189 #include "ss_tritmp.h"
 190
 191 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 192 #define TAG(x) x##_twoside_unfilled
 193 #include "ss_tritmp.h"
 194
 195 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 196 #define TAG(x) x##_offset_twoside_unfilled
 197 #include "ss_tritmp.h"
 198
 199 #define IND (0|SS_RGBA_BIT)
 200 #define TAG(x) x##_rgba
 201 #include "ss_tritmp.h"
 202
 203 #define IND (SS_OFFSET_BIT|SS_RGBA_BIT)
 204 #define TAG(x) x##_offset_rgba
 205 #include "ss_tritmp.h"
 206
 207 #define IND (SS_TWOSIDE_BIT|SS_RGBA_BIT)
 208 #define TAG(x) x##_twoside_rgba
 209 #include "ss_tritmp.h"
 210
 211 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_RGBA_BIT)
 212 #define TAG(x) x##_offset_twoside_rgba
 213 #include "ss_tritmp.h"
 214
 215 #define IND (SS_UNFILLED_BIT|SS_RGBA_BIT)
 216 #define TAG(x) x##_unfilled_rgba
 217 #include "ss_tritmp.h"
 218
 219 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 220 #define TAG(x) x##_offset_unfilled_rgba
 221 #include "ss_tritmp.h"
 222
 223 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 224 #define TAG(x) x##_twoside_unfilled_rgba
 225 #include "ss_tritmp.h"
 226
 227 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 228 #define TAG(x) x##_offset_twoside_unfilled_rgba
 229 #include "ss_tritmp.h"
 230
 231
 232 void _swsetup_trifuncs_init( GLcontext *ctx )
 233 {
 234    (void) ctx;
 235
 236    init();
 237    init_offset();
 238    init_twoside();
 239    init_offset_twoside();
 240    init_unfilled();
 241    init_offset_unfilled();
 242    init_twoside_unfilled();
 243    init_offset_twoside_unfilled();
 244
 245    init_rgba();
 246    init_offset_rgba();
 247    init_twoside_rgba();
 248    init_offset_twoside_rgba();
 249    init_unfilled_rgba();
 250    init_offset_unfilled_rgba();
 251    init_twoside_unfilled_rgba();
 252    init_offset_twoside_unfilled_rgba();
 253 }
 254
 255
 256 static void swsetup_points( GLcontext *ctx, GLuint first, GLuint last )
 257 {
 258    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 259    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 260    GLuint i;
 261
 262    if (VB->Elts) {
 263       for (i = first; i < last; i++)
 264          if (VB->ClipMask[VB->Elts[i]] == 0)
 265             _swrast_Point( ctx, &verts[VB->Elts[i]] );
 266    }
 267    else {
 268       for (i = first; i < last; i++)
 269          if (VB->ClipMask[i] == 0)
 270             _swrast_Point( ctx, &verts[i] );
 271    }
 272 }
 273
 274 static void swsetup_line( GLcontext *ctx, GLuint v0, GLuint v1 )
 275 {
 276    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 277    _swrast_Line( ctx, &verts[v0], &verts[v1] );
 278 }
 279
 280
 281
 282 void _swsetup_choose_trifuncs( GLcontext *ctx )
 283 {
 284    TNLcontext *tnl = TNL_CONTEXT(ctx);
 285    GLuint ind = 0;
 286
 287    if (ctx->Polygon.OffsetPoint ||
 288        ctx->Polygon.OffsetLine ||
 289        ctx->Polygon.OffsetFill)
 290       ind |= SS_OFFSET_BIT;
 291
 292    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 293       ind |= SS_TWOSIDE_BIT;
 294
 295    /* We piggyback the two-sided stencil front/back determination on the
 296     * unfilled triangle path.
 297     */
 298    if ((ctx->_TriangleCaps & DD_TRI_UNFILLED) ||
 299        (ctx->Stencil.Enabled && ctx->Stencil.TestTwoSide))
 300       ind |= SS_UNFILLED_BIT;
 301
 302    if (ctx->Visual.rgbMode)
 303       ind |= SS_RGBA_BIT;
 304
 305    tnl->Driver.Render.Triangle = tri_tab[ind];
 306    tnl->Driver.Render.Quad = quad_tab[ind];
 307    tnl->Driver.Render.Line = swsetup_line;
 308    tnl->Driver.Render.Points = swsetup_points;
 309
 310    ctx->_Facing = 0;
 311 }